JP3182633U - Building energy plant - Google Patents

Abstract

Provided is an energy plant that can achieve power saving, energy saving, and peak cut, and can reduce various energy costs.
A cogeneration system 1 has a generator 1B that generates electric power from an internal combustion engine and outputs generated electric power generated by the generator and thermal energy of the internal combustion engine generated during power generation, and a commercial power system 10 Are connected to the grid 20 of the generated power, and a power grid interconnection unit 2 is provided for switching to selectively output both the commercial power and / or the generated power. Further, a cold / hot water heat source is created by selectively using the commercial power, the generated power, and the thermal energy, and in the time zone when the power load is low, only the commercial power is selected to create the cold water heat source. Part 3, chilled water heat exchanger 30B for exchanging heat with a chilled water heat source made by the cold / hot water heat source part, and chilled water heat storage tank part 4 for storing chilled water heat-exchanged by the chilled water heat exchanger as a heat source, Is provided.
[Selection] Figure 1

Description

  The present invention relates to an energy plant that generates power for buildings and a heat source for air conditioning and hot water supply.

  As a building energy plant related to the present invention, a cogeneration system (CGS) that generates and supplies electric power with a generator driven by a prime mover that uses city gas or the like as fuel is known.

  The prior art described in Patent Document 1 below uses commercial power and power generated by CGS in combination, and uses only commercial power during a low power load period (for example, midnight). In a time zone in which power is supplied and the power load is high, power is supplied using a combination of commercial power and power generated by CGS.

JP 2000-299116 A

  According to the prior art described in Patent Document 1, only commercial power is used or a combination of commercial power and power generated by a generator is used depending on the time zone when the power load is low and the time zone when the power load is high. By doing so, electric energy can be used efficiently and wasteful heat energy can be suppressed.

  Moreover, the prior art described in Patent Document 1 describes that the heat discharged from the prime mover is recovered, and a heat storage unit is provided using this heat. It can be used for heating.

  However, due to the recent improvement in thermal insulation performance of buildings and the use of total heat exchangers, the heating load of buildings has been remarkably reduced, but conversely, the cooling load is larger than the heating load, especially on a large scale. In the case of a modern building, the heat demand throughout the year is much lower than the cold demand, and the cold demand varies greatly depending on the season. For this reason, there is a problem that a building with a large capacity CGS cannot efficiently use the heat energy from the prime mover throughout the year.

  An object of the present invention is to deal with such a problem. That is, it is possible to efficiently use commercial power and power generated by CGS, to be able to efficiently use thermal energy generated during power generation by CGS, and to save power from commercial power and CGS by efficiently using each power and thermal energy, It is an object of the present invention to save the fuel for operating the prime mover by saving electric power by CGS, to achieve power saving, energy saving, peak cut, and to reduce various energy costs.

  In order to achieve the above object, an energy plant for buildings according to the present invention has at least the following configuration.

  A cogeneration system having a generator for generating power by the internal combustion engine, and outputting the generated power generated by the generator and the thermal energy of the internal combustion engine generated during power generation, a commercial power system, and the generated power system; Is connected, and selectively uses the commercial power, the generated power, and the thermal energy, and the power grid interconnection unit that switches to selectively output both or one of the commercial power and the generated power. A cold / hot water heat source and a cold / hot water heat source section that selects only the commercial power to create a cold water heat source and a cold water that exchanges heat with the cold / hot water heat source created by the cold / hot water heat source section during a time period when the power load is low. A chilled water heat storage tank section that stores the chilled water heat-exchanged by the chilled water heat exchanger as a chilled water heat source used for a cooling load in a time zone when the power load is high. Is the energy plant of the building, characterized in that there.

  With this feature, the present invention has the following effects. In other words, a chilled / hot water heat source is created by selectively using commercial power, generated power, and thermal energy, and in a time zone where the power load is low, only commercial power is selected to create a chilled water heat source. Since heat is stored as a heat source used for a cooling load in a high-load time zone, it is possible to efficiently use commercial power and power generated by CGS and efficiently use thermal energy generated during power generation using CGS. By efficiently using each electric power and thermal energy, it is possible to save commercial power and power by CGS, and by saving power by CGS, it is possible to save fuel for operating the prime mover. As a result, power saving, energy saving, and peak cut can be achieved, and reductions in various energy costs can be achieved.

It is a piping lineblock diagram showing an example of an embodiment of an energy plant of a building concerning the present invention. It is a flowchart which shows the cold water thermal storage driving | operation operation | movement in FIG. It is a flowchart which shows the air_conditionaing | cooling driving | operation operation | movement in FIG. It is a flowchart which shows the heating operation operation | movement in FIG.

  The thermal energy described below is generated by the heat of the exhaust gas exhausted during combustion of the internal combustion engine, the steam and hot water produced by the heat of the exhaust gas, the heat of the cooling water for cooling the internal combustion engine, and the heat of the cooling water. It is warm water.

  The internal combustion engine described below is a reciprocating engine that is driven by fuel such as city gas, LP gas, light oil, and waste oil.

  Hereinafter, an example of an embodiment of a building energy plant A according to the present invention will be described with reference to FIG.

  The energy plant A includes a CGS 1, a power grid interconnection unit 2, a cold / hot water system heat source unit 3, and a cold water heat storage tank unit 4, and uses commercial power and generated power and thermal energy output from the CGS 1. In addition to making a cold / hot water heat source used for air conditioning (cooling / humidification) and hot water supply of a building (not shown), the cold water heat source used for the cooling load is stored.

  Further, the commercial power system 10 and the generated power system 20 are connected to the power system interconnection unit 2, and the commercial power and the generated power are distributed to the building via the power system interconnection unit 2. Yes.

  The CGS 1 includes an internal combustion engine 1A, a generator 1B that generates electric power using the internal combustion engine 1A, a jacket hot water heat exchanger 1C that exchanges heat using the cooling water of the internal combustion engine 1A, and steam using the exhaust gas of the internal combustion engine 1A. A steam boiler 1D is provided.

  The internal combustion engine 1A is an engine that uses city gas supplied to a building as fuel, and the generator 1B is driven to generate power by transmitting the shaft rotation of the internal combustion engine 1A to the motor shaft 10B of the generator 1B. ing.

  The generator 1 </ b> B is connected to the power system interconnection unit 2 via the generated power system 20.

  The jacket hot water heat exchanger 1C is a cooling water circulating pipe 10C for circulating cooling water between the jacket hot water heat exchanger 1C and the internal combustion engine 1A, and a hot water heat source circulating between the jacket hot water heat exchanger 1C and the cold / hot water system heat source section 3. The hot water heat source circulation pipe 11C is piped, and the hot water returned from the cold / hot water system heat source section 3 is exchanged with hot water using the cooling water heated by cooling the internal combustion engine 1A. Yes.

  The steam boiler 1D is provided with an exhaust pipe 10D for exhaust gas exhausted from the internal combustion engine 1A. The steam is generated by the heat of the exhaust gas. Further, the steam boiler 1D is provided with a steam pipe 11D for supplying steam to the cold / hot water system heat source section 3 and a drain pipe 12D returned from the cold / hot water system heat source section 3 to the steam boiler 1D.

  The chilled / hot water system heat source unit 3 is a chilled water heat source, a cooling / heating load 5, a hot water supply / humidification heat source that serves as a chilled water storage heat source for the chilled water storage tank unit 4 by commercial power, generated power and thermal energy supplied by the CGS 1. It makes a cold / hot water heat source.

  The cold / hot water system heat source unit 3 includes a warm water system heat source unit 3A and a cold water system heat source unit 3B. The warm water system heat source unit 3A creates a warm water source for heating, and the cold water system heat source unit 3B is used for cooling. The cold water heat source is made, and the hot water heat source and the cold water heat source are used as a heat source for cold water heat storage, for the heating / cooling load 5, for hot water supply, and for humidification as necessary.

  A chilled / hot water circulation pipe 3C flows so that the chilled / hot water heat source circulates between the hot / cold water source 3A, the chilled water source 3B, and the cooling / heating load 5, and various pumps arranged in the path of the chilled / hot water circulation pipe 3C. (Not shown) is operated selectively, and various valves (not shown) arranged in the path of the chilled / hot water circulation pipe 3C are selectively opened and closed to act on the heating / cooling load 5A. The hot water heat source is switched to the cold water heat source of the cold water heat source unit 3B.

  The hot water system heat source unit 3A includes a hot water system heat exchanger 30A, a humidifying steam generator 31A, a hot water tank 32A, and a water supply source 33A.

  The hot water heat exchanger 30A is arranged in the path of the cold / hot water circulation pipe 3C and in the path of the hot water heat source circulation pipe 11C through which the hot water heated by the jacket hot water heat exchanger 1C flows, and flows through the cold / hot water circulation pipe 3C by this hot water. The heat source is heated to become a hot water heat source.

  The humidifying steam generator 31A is disposed in the path of the steam pipe 11D through which steam generated by the steam boiler 1D flows, and generates steam for humidification from the water supplied from the water supply source 33A by this steam. Steam is supplied to the cooling / heating load 5.

  The hot water storage tank 32A is disposed in the path between the hot water heat source circulation pipe 11C and the steam pipe 11D, and heats water supplied from the water supply source 33A by hot water flowing through the hot water heat source circulation pipe 11C or steam flowing through the steam pipe 11D. It is designed to make hot water.

  In the figure, the hot water heat source circulation pipe 11C, the steam pipe 11D, and the drain pipe 12D are continuous at aa, bb, cc, and dd shown on the CGS1 side and the hot water system heat source section 3A.

  That is, the hot water system heat source unit 3A can be a hot water heat source for the heating load, a humidifying steam, and a heat source used for hot water supply only by the thermal energy from the CGS 1.

  The cold water heat source unit 3B includes a cold water heat exchanger 30B, an exhaust heat / gas absorption refrigerator 31B, and an electric refrigerator 31C.

  The cold water heat exchanger 30B is arranged in the path of the cold / hot water circulation pipe 3C, and in the path of the cold water circulation pipe 40 piped so that the cold water stored in the cold water heat storage tank section 4 circulates in the cold water heat storage tank section 4, It cools with the cold water which flows through the cold water circulation piping 40 so that the heat source which flows through 3C of cold / hot water circulation piping becomes a cold water heat source.

  The exhaust heat / gas absorption type refrigerator 31B is disposed in the path of the cold / hot water circulation pipe 3C and in the path of the hot water heat source circulation pipe 11C, the steam pipe 11D, and the drain pipe 12D, and the heat source flowing through the cold / hot water circulation pipe 3C is It is supposed to be cooled.

  In the figure, the exhaust heat / gas absorption type refrigerator 31B continues at aa, bb, cc, and dd shown on the CGS1 side and the cold water heat source unit 3B.

  The electric refrigerator 31C is arranged in the path of the cold / hot water circulation pipe 3C, and is cooled by commercial power and generated power so that the heat source flowing through the cold / hot water circulation pipe 3C becomes the cold water heat source.

  The exhaust heat / gas absorption type refrigerator 31B and the electric refrigerator 31C both make a cold water heat source, but can be operated simultaneously or independently depending on the season, temperature, and time.

  For example, at the time when the summer temperature is high and the cooling load becomes large, the cold water heat source is used in both the exhaust heat / gas absorption type refrigerator 31B and the electric refrigerator 31C using commercial power, generated power by CGS1 and thermal energy. Can be supplied to the cooling / heating load 5. Moreover, the cold water heat source stored in the cold water heat storage tank part 4 can also be utilized.

  On the other hand, at the time when there is no cooling load (midnight), using cold commercial power (midnight power), a cold water heat source is created by the electric refrigerator 31C, and cold water is stored in the cold water storage tank 4, and this heat is stored. The chilled water heat source can be used as the chilled water heat source of the chilled water heat exchanger 30B in the cooling operation on the next day.

  That is, this chilled water heat source unit 3B can use commercial power and city gas efficiently by properly using the chilled water heat source as necessary depending on the commercial power and the generated power and thermal energy generated by CGS1. It is possible to achieve power saving, energy saving, peak cut, and miniaturization of the electric refrigerator 31C.

  The chilled water heat storage tank section 4 stores a chilled water heat source, and a chilled water circulation pipe 40 is provided between the high temperature side H and the low temperature side C, and stores the chilled water heat source cooled by the chilled water heat exchanger 30B. It is like that.

  Next, the cold water heat storage operation operation, the cooling operation operation, and the heating operation operation of the energy plant A configured as described above will be described with reference to FIGS.

  2 to 4, the parts indicated by bold lines are the state in which commercial power and generated power are output, the state in which thermal energy is output, the state in which a cold / hot water heat source is flowing, water / warm water / steam It shows the state that is flowing.

  FIG. 2 is a flowchart showing the cold water heat storage operation of the energy plant A that stores the cold water heat source in the cold water heat storage tank section 4 at the time when the cooling load disappears (midnight).

  The cold water heat storage operation of the energy plant A performs cold water heat storage in the cold water heat storage tank section 4 by operating the electric refrigerator 31C using only inexpensive nighttime commercial power (late night power) with the CGS 1 stopped. It is.

  At this time, the pump is circulated so that the chilled water heat source circulates only to the portion extending between the chilled water heat exchanger 30B and the electric refrigerator 31C in the chilled / hot water circulation pipe 3C on the hot water system heat source unit 3A side and the chilled water system heat source unit 3B side. Operates and stops and opens and closes the valve. Further, the pump (not shown) is operated and stopped, and the valve (not shown) is opened and closed so that the cold water heat source of the cold water heat storage tank section 4 circulates from the high temperature side H to the low temperature side C.

  By operating the energy plant A as described above, it is possible to perform cold water heat storage in the cold water heat storage tank unit 4 using inexpensive late-night power, and use the stored cold water heat source for the next day cooling operation. Therefore, it is possible to achieve power saving and energy saving at the time and time when the cooling load increases.

  FIG. 3 is a flowchart showing a cooling operation operation of the energy plant A that supplies a cooling water heat source to the cooling / heating load 5 at a time when the temperature in summer is high and the cooling load becomes large.

  The cooling operation of the energy plant A includes commercial power, generated power from the CGS 1 and thermal energy, and further using a chilled water heat source stored in the chilled water heat storage tank section 4, a chilled water heat exchanger 30B, exhaust heat / gas absorption The type refrigerator 31B and the electric refrigerator 31C are operated to supply a cold water heat source to the air conditioning load.

  At this time, the chilled water heat exchanger 30B, the exhaust heat / gas absorption chiller 31B, the electric chiller 31C, and the cooling / heating load 5 out of the chilled / hot water circulation pipe 3C on the warm water heat source 3A side and the chilled water heat source 3B side. The pump is operated and stopped and the valve is opened and closed so that the cold water heat source circulates only to the site. Moreover, while operating and stopping a pump so that the cold-water heat source of the cold-water thermal storage tank part 4 may circulate from the low temperature side C to the high temperature side H, a valve is opened and closed.

  By operating the energy plant A as described above, a chilled water heat source can be created by efficiently using commercial power, generated power, thermal energy, and chilled water heat storage, thereby achieving power saving and energy saving.

  Moreover, since both the commercial power and the power generated by CGS1 are used, it is possible to achieve power saving of commercial power other than the power for cooling operation used in the building.

  The cooling operation according to the flow chart shown in FIG. 3 is not limited to the summer season when the cooling load is large, but also during the rainy season, summer and autumn end periods, spring and summer end periods, etc. You may make it also perform in. In this case, by adjusting the output of the commercial power and the amount of power generated by the CGS 1 as necessary, efficient cooling that achieves power saving and energy saving can be performed.

  FIG. 4 is a flowchart showing the heating operation of the energy plant A that supplies a hot water heat source to the cooling / heating load 5 at the time when the heating load in winter increases. If necessary, the cooling water heat source stored in the cold water heat storage tank 4 on the previous day can be supplied to the cooling / heating load 5 for cooling operation.

  In the heating operation of the energy plant A, the hot water heat exchanger 30A is operated using the thermal energy from the CGS 1 to supply a hot water heat source to the cooling / heating load 5. In this heating operation, the humidifying steam generator 31A may be operated as necessary to supply the humidifying steam to the cooling / heating load 5 (in the drawing, the supply state of the humidifying steam is shown).

  At this time, in the hot / cold water circulation pipe 3C on the hot water system heat source unit 3A side and the cold water system heat source unit 3B side, the hot water system heat exchanger 30A and the part over the cooling / heating load 5, the cold water system heat exchanger 30B and the part over the cooling / heating load 5 The pump is operated and stopped and the valve is opened and closed so that the hot water heat source circulates. Moreover, while operating and stopping a pump so that the cold-water heat source of the cold-water thermal storage tank part 4 may circulate from the low temperature side C to the high temperature side H, a valve is opened and closed.

  By operating the energy plant A as described above, it is possible to create a hot water heat source using only the thermal energy from the CGS 1, and this hot water heat source can be used for heating operation. Power saving and energy saving can be achieved.

  It should be noted that the present invention is not limited to the illustrated embodiment, and can be implemented with a configuration without departing from the contents described in the claims of the utility model registration.

A: Energy plant 1: CGS (Cogeneration system)
DESCRIPTION OF SYMBOLS 1A: Internal combustion engine 1B: Generator 10: Commercial power system 20: Generated power system 2: Power system connection part 3: Cold / hot water system heat source part 30B: Cold water system heat exchanger 4: Cold water thermal storage tank part

Claims (1)

A cogeneration system having a generator for generating electricity by the internal combustion engine, and outputting the generated power generated by the generator and the thermal energy of the internal combustion engine generated during power generation;
A power grid interconnection unit that is connected to a commercial power grid and the generated power grid, and that selectively switches both the commercial power and the generated power to be output, or
A cold / hot water heat source that selectively uses the commercial power, the generated power, and the thermal energy to create a cold / hot water heat source in a time zone where the power load is low, and that selects only the commercial power and creates a cold water heat source; ,
A cold water heat exchanger for exchanging heat with a cold water heat source produced by the cold / hot water heat source section;
A chilled water heat storage tank section for storing chilled water heat-exchanged in the chilled water heat exchanger as a chilled water heat source used for a cooling load in a time zone when the power load is high;
A building energy plant characterized by comprising:

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